switch surface to sk_sp

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1817383002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot

Review URL: https://codereview.chromium.org/1817383002
diff --git a/bench/DisplacementBench.cpp b/bench/DisplacementBench.cpp
index c22b8fd..eadafb6 100644
--- a/bench/DisplacementBench.cpp
+++ b/bench/DisplacementBench.cpp
@@ -48,7 +48,7 @@
     void makeCheckerboard() {
         const int w = this->isSmall() ? FILTER_WIDTH_SMALL : FILTER_WIDTH_LARGE;
         const int h = this->isSmall() ? FILTER_HEIGHT_LARGE : FILTER_HEIGHT_LARGE;
-        SkAutoTUnref<SkSurface> surface(SkSurface::NewRasterN32Premul(w, h));
+        auto surface(SkSurface::MakeRasterN32Premul(w, h));
         SkCanvas* canvas = surface->getCanvas();
         canvas->clear(0x00000000);
         SkPaint darkPaint;